there are no offensive zetsu moves when zetsu splits. One should be added for both white zets and black zets.
-White Zetsu
Hōshi no Jutsu (Spore Technique)- zetsu fires a beam of spores at opponent with a 1 tile width. If caught by spores, zets gains 1/4 of your chakra and hp while youre stunned for 5 secs.
-Black Zetsu
Mokuton: Jigoku no Ran (Underground Roots Technique/Revolt of Hell)- zetsu creates an area of roots that damage and stun the opponent.